linux-kernel - RE: [PATCH][next] cpufreq: amd-pstate: Fix min_perf assignment in amd_pstate_adjust

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Date: Wed, 7 Feb 2024 13:54:47 +0000
From: "Yuan, Perry" <Perry.Yuan@....com>
To: Tor Vic <torvic9@...lbox.org>, "Huang, Ray" <Ray.Huang@....com>,
	"rafael@...nel.org" <rafael@...nel.org>, "Limonciello, Mario"
	<Mario.Limonciello@....com>, "Shenoy, Gautham Ranjal"
	<gautham.shenoy@....com>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, Oleksandr Natalenko
	<oleksandr@...alenko.name>, "Yuan, Perry" <Perry.Yuan@....com>
Subject: RE: [PATCH][next] cpufreq: amd-pstate: Fix min_perf assignment in
 amd_pstate_adjust_perf()

[AMD Official Use Only - General]

 Hi Tor,

> -----Original Message-----
> From: Tor Vic <torvic9@...lbox.org>
> Sent: Wednesday, February 7, 2024 9:09 PM
> To: Huang, Ray <Ray.Huang@....com>; Yuan, Perry
> <Perry.Yuan@....com>; rafael@...nel.org
> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; linux-
> pm@...r.kernel.org; Oleksandr Natalenko <oleksandr@...alenko.name>
> Subject: [PATCH][next] cpufreq: amd-pstate: Fix min_perf assignment in
> amd_pstate_adjust_perf()
>
> In the function amd_pstate_adjust_perf(), the 'min_perf' variable is set to
> 'highest_perf' instead of 'lowest_perf'.
>
> Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD
> P-State")
> Reported-by: Oleksandr Natalenko <oleksandr@...alenko.name>
> Signed-off-by: Tor Vic <torvic9@...lbox.org>
> ---
> IIRC, this was first reported by Oleksandr, hence the 'Reported-by' tag.
> ---
>   drivers/cpufreq/amd-pstate.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 08e112444c27..aa5e57e27d2b 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -577,7 +577,7 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
>       if (target_perf < capacity)
>               des_perf = DIV_ROUND_UP(cap_perf * target_perf,
> capacity);
>
> -     min_perf = READ_ONCE(cpudata->highest_perf);
> +     min_perf = READ_ONCE(cpudata->lowest_perf);
>       if (_min_perf < capacity)
>               min_perf = DIV_ROUND_UP(cap_perf * _min_perf, capacity);
>
> --
> 2.43.0

Thanks for the fix!

Reviewed-by: Perry Yuan <Perry.Yuan@....com>